"Obviously, after the announcement and E3, there was some feedback about what people wanted to change," Spencer explained.

"There was a real discussion about whether we should have an optical disc drive in Xbox One or if we could get away with a purely disc-less console, but when you start looking at bandwidth and game size, it does create issues.

"So we decided - which I think was the right decision - to go with the Blu-ray drive and give the people an easy way to install a lot of content.

"From some of those original thoughts, you saw a lot of us really focusing on the digital ecosystem you see on other devices - thinking of and building around that."